In my opinion, it's futile to troubleshoot UTF-8 issues without understanding the underlying implementation and keeping track of the SVf_UTF8 flag, using Encode::is_utf8() when convenient and Devel::Peek's Dump() when necessary.

The interface for Encode::is_utf8() is dreadful, but it's better than flailing in the dark.

In reply to Re^2: UTF-8: Trying to make sense of form input by creamygoodness
in thread UTF-8: Trying to make sense of form input by cosmicperl

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